如何在WPF中使用GDI +绘图？

在WPF中使用GDI+绘图，可以通过以下步骤实现：

1. 添加GDI+相关的命名空间

using System.Drawing;
using System.Drawing.Imaging;
using System.Windows.Media.Imaging;

1. 创建一个System.Drawing.Graphics对象，用于绘制图形

Bitmap bitmap = new Bitmap(width, height, PixelFormat.Format32bppArgb);
Graphics graphics = Graphics.FromImage(bitmap);

1. 使用System.Drawing.Graphics对象进行绘图

graphics.Clear(Color.White);
graphics.DrawString("Hello, GDI+ in WPF!", new Font("Arial", 20), new SolidBrush(Color.Black), new PointF(50, 50));

1. 将System.Drawing.Bitmap对象转换为System.Windows.Media.Imaging.BitmapSource对象，以便在WPF中显示

MemoryStream memoryStream = new MemoryStream();
bitmap.Save(memoryStream, ImageFormat.Png);
memoryStream.Position = 0;
BitmapImage bitmapImage = new BitmapImage();
bitmapImage.BeginInit();
bitmapImage.StreamSource = memoryStream;
bitmapImage.CacheOption = BitmapCacheOption.OnLoad;
bitmapImage.EndInit();
bitmapImage.Freeze();

1. 将System.Windows.Media.Imaging.BitmapSource对象设置为WPF控件的Source属性

image.Source = bitmapImage;

完整的示例代码如下：

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Windows;
using System.Windows.Media.Imaging;
namespace WpfApp1
    public partial class MainWindow : Window
        public MainWindow()
            InitializeComponent();
            int width = 800;
            int height = 600;
            Bitmap bitmap = new Bitmap(width, height, PixelFormat.Format32bppArgb);
            Graphics graphics = Graphics.FromImage(bitmap);
            graphics.Clear(Color.White);
            graphics.DrawString("Hello, GDI+ in WPF!", new Font("Arial", 20), new SolidBrush(Color.Black), new PointF(50, 50));
            MemoryStream memoryStream = new MemoryStream();
            bitmap.Save(memoryStream, ImageFormat.Png);
            memoryStream.Position = 0;
            BitmapImage bitmapImage = new BitmapImage();
            bitmapImage.BeginInit();
            bitmapImage.StreamSource = memoryStream;
            bitmapImage.CacheOption = BitmapCacheOption.OnLoad;
            bitmapImage.EndInit();